We had already shared easy to use utility AnimationGIF which allows you to create animation by selecting various images from your computer.
But some time you might need to create an animation from your video file which you had on you saved on computer. GifNinja is a nice online web tool which allows you to create animation from any video or image file.
Just visit the site and then you have to select the file which animation you want to create, if you wanna create animation from video file then you can select any video with length of 4 seconds.
If you wanna create animations from images then select all images by pressing CTRL and clicking on images, and within few seconds you will get your animation ready.
Once your animation is ready you will presented with the option of selection speed of animation, just move the slider left or right to adjust the speed.